Re: [PATCH v1 1/5] pinctrl: mediatek: Check gpio pin number and use binary search in mtk_hw_pin_field_lookup()
From: Sean Wang <sean.wang@kernel.org>
Date: 2019-08-13 22:54:42
Also in:
linux-mediatek, lkml
On Tue, Aug 13, 2019 at 1:53 AM Light Hsieh [off-list ref] wrote:
From: Light Hsieh <redacted>
1. Check if gpio pin number is in valid range to prevent from get invalid
pointer 'desc' in the following code:
desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio];
2. Use binary search in mtk_hw_pin_field_lookup()
Modify mtk_hw_pin_field_lookup() to use binary search for accelerating
search.
Change-Id: I22b4644ec216b90dd9dd5e223cc41d43761701b0remove all of Change-Id in all the patches in the series
quoted hunk ↗ jump to hunk
--- drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c | 24 +++++++++++++++++++----- drivers/pinctrl/mediatek/pinctrl-paris.c | 19 +++++++++++++++++++ 2 files changed, 38 insertions(+), 5 deletions(-)diff --git a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c index 20e1c89..4687f63 100644 --- a/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c +++ b/drivers/pinctrl/mediatek/pinctrl-mtk-common-v2.c@@ -68,7 +68,7 @@ static int mtk_hw_pin_field_lookup(struct mtk_pinctrl *hw, { const struct mtk_pin_field_calc *c, *e; const struct mtk_pin_reg_calc *rc; - u32 bits; + u32 bits, start = 0, end, found = 0, check;
variable found should be bool type, and the declaration should be listed in reverse Xmas tree order
quoted hunk ↗ jump to hunk
if (hw->soc->reg_cal && hw->soc->reg_cal[field].range) { rc = &hw->soc->reg_cal[field];@@ -79,21 +79,32 @@ static int mtk_hw_pin_field_lookup(struct mtk_pinctrl *hw, return -ENOTSUPP; } + end = rc->nranges - 1; c = rc->range; e = c + rc->nranges; - while (c < e) { - if (desc->number >= c->s_pin && desc->number <= c->e_pin) + while (start <= end) { + check = (start + end) >> 1; + if (desc->number >= rc->range[check].s_pin + && desc->number <= rc->range[check].e_pin) { + found = 1;
found = true;
quoted hunk ↗ jump to hunk
break; - c++; + } else if (start == end) + break; + else if (desc->number < rc->range[check].s_pin) + end = check - 1; + else + start = check + 1; } - if (c >= e) { + if (!found) { dev_dbg(hw->dev, "Not support field %d for pin = %d (%s)\n", field, desc->number, desc->name); return -ENOTSUPP; } + c = rc->range + check; + if (c->i_base > hw->nbase - 1) { dev_err(hw->dev, "Invalid base for field %d for pin = %d (%s)\n",@@ -182,6 +193,9 @@ int mtk_hw_set_value(struct mtk_pinctrl *hw, const struct mtk_pin_desc *desc, if (err) return err; + if (value < 0 || value > pf.mask) + return -EINVAL; + if (!pf.next) mtk_rmw(hw, pf.index, pf.offset, pf.mask << pf.bitpos, (value & pf.mask) << pf.bitpos);diff --git a/drivers/pinctrl/mediatek/pinctrl-paris.c b/drivers/pinctrl/mediatek/pinctrl-paris.c index 923264d..28b4951 100644 --- a/drivers/pinctrl/mediatek/pinctrl-paris.c +++ b/drivers/pinctrl/mediatek/pinctrl-paris.c@@ -693,6 +693,9 @@ static int mtk_gpio_get_direction(struct gpio_chip *chip, unsigned int gpio) const struct mtk_pin_desc *desc; int value, err; + if (gpio > hw->soc->npins) + return -EINVAL; + desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio]; err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DIR, &value);@@ -708,6 +711,9 @@ static int mtk_gpio_get(struct gpio_chip *chip, unsigned int gpio) const struct mtk_pin_desc *desc; int value, err; + if (gpio > hw->soc->npins) + return -EINVAL; + desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio]; err = mtk_hw_get_value(hw, desc, PINCTRL_PIN_REG_DI, &value);@@ -722,6 +728,9 @@ static void mtk_gpio_set(struct gpio_chip *chip, unsigned int gpio, int value) struct mtk_pinctrl *hw = gpiochip_get_data(chip); const struct mtk_pin_desc *desc; + if (gpio > hw->soc->npins) + return; + desc = (const struct mtk_pin_desc *)&hw->soc->pins[gpio]; mtk_hw_set_value(hw, desc, PINCTRL_PIN_REG_DO, !!value);@@ -729,12 +738,22 @@ static void mtk_gpio_set(struct gpio_chip *chip, unsigned int gpio, int value) static int mtk_gpio_direction_input(struct gpio_chip *chip, unsigned int gpio) { + struct mtk_pinctrl *hw = gpiochip_get_data(chip); + + if (gpio > hw->soc->npins) + return -EINVAL; + return pinctrl_gpio_direction_input(chip->base + gpio); } static int mtk_gpio_direction_output(struct gpio_chip *chip, unsigned int gpio, int value) { + struct mtk_pinctrl *hw = gpiochip_get_data(chip); + + if (gpio > hw->soc->npins) + return -EINVAL; + mtk_gpio_set(chip, gpio, value); return pinctrl_gpio_direction_output(chip->base + gpio); --1.8.1.1.dirty